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MICROBIAL TOXICITY OF NEW Bacillus thuringiensis ISOLATES IN TWO POPULATIONS OF Spodoptera frugiperda ORIGINATING FROM MINAS GERAIS AND ESPÍRITO SANTO

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Author(s): DIRCEU PRATISSOLI | RICARDO ANTONIO POLANCZYK | EDUARDO DOMINGOS GRECCO | RENATA APARECIDA FERREIRA | ANDERSON MATHIAS HOLTZ

Journal: Revista Brasileira de Milho e Sorgo
ISSN 1676-689X

Volume: 6;
Issue: 2;
Start page: 140;
Date: 2007;
Original page

Keywords: Zea mays | entomopathogens | fall armyworm

ABSTRACT
The experiment was carried out at the Laboratory of Entomology of theCentro de Ciências Agrárias da Universidade Federal do Espírito Santo (CCA-UFES) seeking to verify the susceptibility of Spodoptera frugiperda larvae from Minas Gerais and Espírito Santo to isolates of the entomopathogenic bacterium Bacillus thuringiensis (Bt) and to observe possible differences between populations susceptibility. Thirty-one isolates were assayed in four bioassays on fall armyworm second instar larvae. Evaluations carried out seven days after treatment application showed that differences in populations susceptibility were observed only for the isolates 06 and 09 and the most promising isolates to both populations were 11, 25, 26, 27 e 229, because they caused 100% of mortality to fall armyworm larvae.
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